You disrupt the conjuring energies within a summoned creature, causing it to violently explode. If the target fails its Fortitude save, it is immediately slain and all creatures within 20 feet of the target take 1d4 points of damage per spell level of the summoning spell that conjured the target

You create a magical field around summoned creatures you control that deflects attacks made against them. The targets gain a deflection bonus to their AC equal to 1 + 1 for every 6 caster levels you possess (maximum +4 deflection bonus at 18th level)

You create an extradimensional link between yourself and one summoned creature you control that allows you to switch places. After casting master's escape, you can teleport to your summoned creature's space as a swift action, causing your summoned creature to teleport to your former space

As black tentacles, except it creates a Large decapitated snake, which erupts from the ground and grapples a creature you specify within its 5-foot reach. As a standard action, you can command the snake to release its grappled target and direct it to attack a different creature.